EASY TO USE GOOD QUANLITY Manufacture and supply various full series of screwdriver bits, nutsetters, nut drivers, sockets, socket adapters, bit holders and quick changeconnectors for screwdriver bitsmaterial types:Cr-V 6150,8660,S2Surface treatment:sandblasted, tin-coating, Cu-coating, Ni-coating, Cr-coating, Zn-coatingHead types:PH, PZ, slot, Torx, square, hex, hex-plus, Z-spanner, Torx hollow, ...